QWidgets, Stylesheets and Future Road Map

I extensively use CSS stylesheets as part of our QWidget applications, applying themes to pretty much all widgets used in the application (both Qt and custom).

What I need to look at soon is the scaling of widgets on high and low resolution displays and one avenue I was considering was looking at the various CSS properties which could help me support this.

I know that CSS has vmin and vmax unit type (albeit not widely supported) which scales an element relative to the viewport size but given that this is a relatively new feature, would we expect to see Qt support for this in the future?

With that in mind, is there a road-map which anyone is aware of which would highlight any future CSS plans?